4K streaming needs a steady 15-25 Mbps — not just a fast internet plan, but a strong signal in the exact spot where the TV lives. Most 'bad streaming' is really a Wi-Fi problem in the last twenty feet.

What you'll need

  • Your Wi-Fi router
  • A phone or laptop for speed tests
  • The streaming device you'll be testing

The steps

  1. Measure what you actually get at the TV

    Stand at the TV with your phone and run a speed test (fast.com is fine, no app needed). Below 25 Mbps there, 4K will struggle. Also check the streaming device's own reading: Roku shows it under Settings > Network > Check connection.

  2. Move the router into the open

    Routers hate cabinets, floors and metal. Get it up high, out in the open, and as central as possible. Each wall between router and TV costs signal; brick, tile and mirrors cost the most.

  3. Pick the right band

    5 GHz (or 6 GHz on Wi-Fi 6E) is faster but shorter-range — best when the router is in the same or an adjacent room. 2.4 GHz travels farther and suits distant rooms. Give the bands different names so you can choose deliberately.

  4. Reduce competition

    In crowded buildings, neighboring networks share channels. Many routers auto-select the least busy channel on restart; a simple reboot can help. Wi-Fi 6 routers handle crowding better than older ones.

  5. Consider Ethernet or mesh

    If the TV room is far from the router, a mesh system or a single Ethernet run beats any amount of fiddling. Streaming boxes like the Roku Ultra, Fire TV Cube, Apple TV 4K (Wi-Fi + Ethernet) and Google TV Streamer have Ethernet ports; sticks can use adapters.

Worth knowing

  • Run the speed test at the time you usually watch — evening congestion is real.
  • Mesh nodes should be placed halfway between the router and the dead zone, not inside it.
  • A streaming device that reports 'Good' or 'Excellent' signal but still buffers may be fighting an overloaded router; restart it monthly.

Common mistakes

  • Testing speed next to the router instead of at the TV.
  • Hiding the router in a media cabinet for looks.
  • Buying a faster internet plan to fix a signal problem in one room.

Research basis: Wi-Fi 5 and Wi-Fi 6 routers with Roku, Fire TV and Google TV devices. Steps checked against current manufacturer documentation as of the last-updated date above.